对于任何使用古腾堡编辑器的人来说，我发现（除了我对公认答案的评论之外）这里还有更多的工作需要做。

古腾堡给儿童注射.block-editor__container 因此，仅仅修改选择器来捕捉更改事件是不够的，您必须注意插入的元素是否正确。使用MutationObserver （因为这是一种更好的实践，它取代了很快被弃用的DOM突变事件，并且full browser support), 这就是我如何完成捕获模板更改的过程：

$ = $ || jQuery; // Allow non-conflicting use of \'$\'

$(function(){

    // Create an observer to watch for Gutenberg editor changes
    const observer = new MutationObserver( function( mutationsList, observer ){

        // Template select box element
        let $templateField = $( \'.editor-page-attributes__template select\' );

        // Once we have the select in the DOM...
        if( $templateField.length ){

            // ...add the handler, then...
            $templateField.on( \'change\', function(){

                // ...do your on-change work here
                console.log( \'The template was changed to \' + $( this ).val() );

            });
            observer.disconnect();

        }

    });
    // Trigger the observer on the nearest parent that exists at \'DOMReady\' time
    observer.observe( document.getElementsByClassName( \'block-editor__container\' )[0], {
        childList: true, // One of the required-to-be-true attributes (throws error if not set)
        subtree: true // Watches for the target element\'s subtree (where the select lives)
    });

});